spencer and his good buddy preston are both mechanics at a shop that does oil changed. They are in a friendly competition to see who can complete the most oil changes in one day. Spender has already finished 8 oil changes today and complete more at a rate of 3 oil changes per hour. Preston just came on shift and can finish 5 oil changes every hour. Write an equation that can be used to find the number of hours (h) it will take for the two buddies to complete the same number of oil changes